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install_process_keyring() may return a broken error code if it encounters an OOM condition.  The problem is this line:

                return ret != -EEXIST ?: 0;

which will return the result of the comparison if it succeeds (i.e. 1).  What it should return is ret.

This isn't too much of a problem.  The worst that can happen is that lookup_user_key() keeps looping around until the OOM condition goes away, but it is allowed to sleep whilst allocating memory.

Created attachment 456226 [details]
Error handling fix

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Patch(es) available on kernel-2.6.32-83.el6

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0542.html